I think the aperture should be stopped down JUST a bit more, so that more of the flower is in focus, but so much as the background would be slightly more in focus; either that, or focus slightly further. I also feel the watermark should be at the lower right corner of the frame, so that it's less there than it is. That said, the colors are great, the composition is good, and the bokeh is wonderful. Cheers.
Great use of a shallow DOF to make the flowers stand out against the same color. It really creates an interesting composition, differing from the usual contrast with a different color than the flower, like a green. On a side note I really like the watermark!